Friction let-off for looms



Aug. 1o 1926.

1,595,265 R. G. TURNER 1 FRICTION LET-OFF FOR LOOMS Filed March 19, 1925Patented aug. 1o, 1926.

*UNITE STATES PTET OFFICE.

EICHARD GREllill'fl'aEAll@1 TURNER, OF WORCESTER, llfIlfiSACH'USE'FJJS,vASSTGNOR TO CROMPTON t KNOW'LES LOOM WORKS, OF WORCESTER, MASSACHUSETTS,A COR- PORATION OF MASSACHUSETTS.

FRICTION LET-OFF FOR LOOMS.

Application led March r19, 1925. Serial' No. 16,800.

tout all the picks between the fell and the p defective pick. Afterthese picks have been removed it is necessary to move the clothbackwardly in the lloom until the fell is in line with the reed beforeweaving `is resumed. It is highly desirable that the ywarp tension bethe same after the pickout as it was before so that a mark will notappear on the cloth. The weaver usually releases the friction and turnsthe beam back by hand but with such a method there is never anyassurance that the warp tension will be proper. It is also necessary tobe able to release. the tension of the warp so n that the clothfcan bemoved forwardly, as

which will appear as the description proceeds, my invention resides inthe combination and arrangement of parts hereinafter described and setforth in the claims.

1n the accompanying drawings wherein I have shown one form of myinvention,

Fig. 1 is an end elevation of a loom-hav.

'ing myV invention applied thereto,

Fig. 2 is a vertical sectijon on line 2-2 of i VFig. 1, and

Fig. 3 is an enlarged vertical section on line 3 3 of 2.

Referring more particularly to the drawingsfit .will beseenA that I haveVprovided a loomifframe 'having the :usual crank shaft 11,' connector12,V and lay 13. The

Vrea-rpart' of the/'frame is provided with.

^ pockets. le which. receive the -gudgeons of `b e'aiiu lSecured to thelwarp beam and concentric with the gudgeons 15 are gears 16 by means ofwhich the beam may be turned either in a forward or a backwarddirection.

Spaced vfrom the beam lV is a shaft 17 kmounted on supports 18 havingsecured thereto near one end thereof a worm gear 19 having an internalfriction Yface 20. A worm 21 is secured 4to a forwardly extending shaft22 and meshes with the worm gear 19. Y The ends of said shaft 22 arereceived by bearings 23 and the forward end thereof is provided with ahand wheel 2e by means of which said worm 21 may be turned in eitherdirection.

Loosely mounted on each end'of shaft 17 is a spider 25 having a pinion26 cast integral therewith to mesh with the adjacent gear 16 andprovided with a plate 27. Slots 28 are cast in each plate 27 to receivebolts 29, said bolts extending freely through the slots 23 and beingheld in position by nuts 30. Said bolts extend through wings 31 whichare formed on friction sectors 32 andv 33, respectively, one pair ofsectors being located on each side of the loom. SaidV sectors are hingedtogether as at 34 and are provided with inwardly extending fingers 35and 36, respectively, the nger 36 receiving a set screw 37 which pressesagainst the finger 35 to expand thel sectors, each of which has aleather facing38..

The gear 19 has a hub 39 which is keyed as at 10 tothe shaft 17 and adrum 411 is secured to that end of the shaft 17 opposite the worm gear19 by a key d2.- One. pair of sectors cooperates with face 20 of gear19- and the other pair cooperates with face 43 of drum 41. Collars 44;prevent end motion of `the gear 19 and drum 11.

YThe operation of my improved let-off will be apparent to those skilledin the art.v During normal weaving the worm 21 will prevent rotation ofthe worm gear 1 9, shaft 17, and drum 11, andas the beam W and gear 16continue to rotate the pinions 26 will be rotated to cause relativefrictional movement between the leather facings .38 and the faces .120'and 43, respectively. The

`.extent of the. friction. and therefore the out, the-weaverwllremove-the picks untilk F il the defective pick is reached, which willleave the fell of the cloth forward of the reed when the latter is onfront center. VJhen the picking out operation is completed the lay willbe moved to forward position and the hand wheel 24 rotated so as tocause a backward or clockwise rotation of the beam V7 as viewed in Fig.l to move the fell of the cloth back to the reed. 'lfhe hand wheel 24:can be turned a short `distance after the fell has reached the reedwithout putting undue tension on the warp threads inasmuch as the onlypressure brought to bear upon the warp beam is thatwhich can betransmitted through the friction, and this is the same friction whichresists forward movement of the beam. The warp threads will therefore berestored to their original tension and weaving may be resumed withoutleaving a mark in ,the cloth.

If for any reason it is necessary to move the cloth forwardly in theloom this result can be accomplished by turning hand wheel 24 in theopposite direction. ln so doing the warp is slaclrened without releasingt-he friction or its adjustment. The worm acts as a stop to hold theworm gear in any position.

From the foregoing it will be seen that l have provided a very simplefriction let-off for looms so arranged as to permit the beam to bereversed without putting the warp threads under undue tension, becauseof the fact that the reverse movement is accomplished by reversing thefriction which normally resists forward movement of the beam and thisfriction is the same whether the beam be turning forwardly or rearwardlyand is not changed in any way during the picking` out operation.

Having thus described my invention it will be apparent that changes andmodications may be made therein by those skilled in the art withoutdeparting from the spirit and scope of the invention, and l do not wishto be limited to the details her-ein disclosed, but what I claim is:

l. In a let-off mechanism for looms, a warp supply, a friction membermovable with the supply as the latter supplies the demand of the loomfor warp, a second friction member to cooperate with and resist themovement lof the first named friction member and warp supply, and areversing device connected to the second named friction member, saiddevice effective to hold said second named friction member in fixedposition during the normal running of the loom and being effective toturn the second named friction member backwardly to reverse thedirection of movement of the first named friction member and the warpsupplyV connected thereto. l

2. In a let-off mechanism for' looms, a

warp supply, a friction member movable with the supply as the lattersupplies the demand of the loom for warp, a second friction member tocooperate with and resist the movement of the first named frictionmember and warp supply, and a reversing device connected to the secondnamed friction member in fixed position during the normal running of theloom and being effective to turn the'second named friction mem-- berbaclrwardly to reverseV the direction of movement of the first namedfriction member and the warp supply connected thereto while the samefrictional contact is preserved between the members as exists undernormal running conditions.

3. In a let-off mechanism for looms, a warp supply, a friction membermovable therewith as the supply moves to furnish the warp required bythe operation of the loom, a second friction member normally contactingwith the first friction member, and a reversing device effective undernormal conditions to hold the second named member in fixed position tocause the same to resist normal forward movement of the first namedfriction member and the warp supply, said reversing device beingeffective also to turn the second named member backwardly and by meansof the normal friction existing between the members to thereby causereverse movement of the first named friction Vmember and the warp supplyconiected thereto. Y

4L. ln a let-off mechanism for looms, a warp supply, a friction membermovable therewith as the supply moves to furnish the warp required bythe operation of the loom, a secondY friction member' normallycontacting with the first friction member, and a reversing deviceeffective under normal conditions to hold the second named member infined position to cause the same to resist normal forward movement ofthe first named friction member and the warp supply, said reversing`device being effective also to turn the second named member backwardlyand by means of the normal friction exist-ing between the members tothereby cause reverse movement of the first named friction member andthe warp supply connected thereto, said device including a worm gearrigid with respect to the second named vfriction member and a wormcooperating with Ysaid worm gear and normally held in fixed longitudinalposition. A

5. In. a let-off mechanism for'looms. a warp supply, a gear movable withthe first named gear, a friction element movable with the second namedgear and comprising a substantially closed ring adjustable asktodiameter, a second friction member cooperating withl the first namedmember to resist movement-thereofand'the gears and warp supply, a wormgear fixedwith respect to the second named friction member, and a Wormcooperating with the Worm gear to hold the latter in fixed positionunder normel conditions and efeetve to move seid worm gear baokwardly toreverse the direction of movement of the first named frieton member andthe Warp supply, the normal frietional Contact between the members beingmaintained during the reversing' movement.

In testimony whereof I have hereunto aiixed my signature. f

RICHARD GREENLEAF TURNER.

